Message from German U-Boat command to Wolfpack TITMOUSE on April 17, 1943 that was intercepted and decipherered by British cryptanalysts in time to warn Convoy SC 127 to turn north away from attack – ciphertext

Paragraph from enciphered message from FBI agent in Mexico City to FBI headquarters in Washington regarding Andrew D. Lee (SNOWMAN) and Christopher J. Boyce (FALCON), U.S. citizens arrested by the FBI in January, 1977, tried, found guilty and sentenced to 40 and 25 years respectively for selling TOP SECRET information to the Russians – ciphertext

Enigma message from German General Kesselring to General Rommel in Africa on 24 April. British cryptographers decrypted this and subsequent messages that eventually led them to the discovery that Rommel was receiving valuable intelligence from German cryptanalysts, who had broken the American BLACK CODE. – ciphertext